GROUTING MATERIAL FOR REINFORCEMENT OF COAL-ROCK MASS IN LOW-TEMPERATURE MINING, AND PREPARATION METHOD AND USE THEREOF

Abstract

The present disclosure relates to a grouting material for reinforcement of coal-rock mass in low-temperature mining. The material includes a component A and a component B, where the component A includes 100 parts of a polyether polyol A and 0.05 parts to 0.1 parts of a catalyst; the component B includes 18 parts to 24 parts of a polyether polyol B, 21 parts to 26 parts of a flame retardant, 50 parts to 61 parts of polyisocyanate, and 0.05 parts of the catalyst. A preparation method of the grouting material includes the following steps: stirring the polyether polyol A and the catalyst to obtain the component A; drying the polyether polyol B and mixing with the polyisocyanate and the catalyst, and conducting a reaction to obtain an isocyanate prepolymer; adding the flame retardant to the isocyanate prepolymer, and adjusting a viscosity to obtain the component B.

Claims

1. A grouting material for reinforcement of coal-rock mass in low-temperature mining, comprising a component A and a component B in parts by weight as follows: component A: 100 parts of a polyether polyol A, and 0.05 parts to 0.1 parts of a catalyst; and component B: 18 parts to 24 parts of a polyether polyol B, 21 parts to 26 parts of a flame retardant, 50 parts to 61 parts of polyisocyanate, and 0.05 parts of the catalyst.

2. The grouting material for reinforcement of coal-rock mass in low-temperature mining according to claim 1, wherein the polyether polyol A is a sorbitol starting agent-typed polyether polyol.

3. The grouting material for reinforcement of coal-rock mass in low-temperature mining according to claim 1, wherein the catalyst is selected from the group consisting of dibutyltin dilaurate, stannous octoate, and a quaternary ammonium salt-based catalyst.

4. The grouting material for reinforcement of coal-rock mass in low-temperature mining according to claim 1, wherein the polyether polyol B is polyaryl polymethylene isocyanate (PAPI).

5. The grouting material for reinforcement of coal-rock mass in low-temperature mining according to claim 1, wherein the flame retardant is one or a combination of two selected from the group consisting of triethyl phosphate and cresyl diphenyl phosphate (CDP).

6. A preparation method of the grouting material for reinforcement of coal-rock mass in low-temperature mining according to claim 1, comprising the following steps: 1) preparation of the component A: stirring the polyether polyol A and the catalyst in a reaction kettle at room temperature for 1 h to obtain the component A; and 2) preparation of the component B: drying the polyether polyol B in a vacuum drying box at a constant temperature of 110° C. for 2 h, cooling to 60° C., adding to the reaction kettle with the polyisocyanate and the catalyst in sequence, and conducting a reaction at 50° C. for 24 h to obtain an isocyanate prepolymer; cooling the isocyanate prepolymer to room temperature, adding the flame retardant, and adjusting a viscosity to 1,000 mPa.Math.s±100 mPa.Math.s to obtain the component B.

7. Use of the grouting material for reinforcement of coal-rock mass in low-temperature mining according to claim 1, comprising: mixing the component A and the component B according to a mass ratio of 1:2 to 1:4 with a chemical grouting pump, injecting a resulting mixture into a crack or cavity to be reinforced, and conducting curing.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0032] FIG. 1 shows a schematic diagram of a temperature change curve of a sample in Example 1.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] To make the to-be-resolved technical problems, the technical solutions, and the beneficial effects of the present disclosure clearer, the present disclosure is described in further detail below with reference to the accompanying drawings and embodiments. Understandably, the specific embodiments described herein are merely intended to explain the present invention but not to limit the present invention.

Example 1

[0034] 1. Preparation of a Component A

[0035] 100 parts of a polyether polyol A (YD-6205, with functionality of 6 and a hydroxyl value of 380±15), 0.05 part of a catalyst dibutyltin dilaurate, and 0.05 part of a catalyst TMR-2 were added into a reaction kettle, and stirred for 1 h to obtain a mixed component A.

[0036] 2. Preparation of a Component B

[0037] 24 parts of a polyether polyol B (PPG-204) was dried in a vacuum drying oven at a constant temperature of 110° C. for 2 h, and cooled to room temperature, and added to a reaction kettle with 50 parts of polyisocyanate and 0.05 part of the catalyst dibutyltin dilaurate in sequence, and a reactor was conducted at 50° C. for 24 h to obtain an isocyanate prepolymer; the isocyanate prepolymer was cooled to room temperature, 26 parts of a flame retardant triethyl phosphate was added, and a viscosity was adjusted to 1,000 mPa.Math.s±100 mPa.Math.s to obtain the component B.

[0038] The components A and B were mixed by stirring according to a mass ratio of 2:5 to obtain a consolidated body, and product indicators were tested according to an AQ/T 1089-2020 standard. The test results were shown in Table 1.

TABLE-US-00001 TABLE 1 Product indicators SN Item Indicator 1 Maximum reaction temperature/° C. 79 2 Oxygen index 29 3 Expansion ratio/fold 1 4 Compressive strength (MPa) 57.7 5 Curing time 6 min 6 Flame retardancy Meeting AQ/T 1089-2020 requirements

[0039] The component A and the component B were mixed according to a mass ratio of 2:5 with a chemical grouting pump, a mixture was injected into a crack or cavity to be reinforced, and curing was conducted.

[0040] As shown in FIG. 1, as the reaction time increases, the maximum reaction temperature does not exceed 100° C., which meets the requirements of safety production industry standards.

Example 2

[0041] 1. Preparation of a Component A

[0042] 100 parts of a polyether polyol A (YD-600, with functionality of 6 and a hydroxyl value of 455±15), 0.05 part of a catalyst dibutyltin dilaurate, and 0.05 part of a catalyst TMR-3 were added into a reaction kettle, and stirred for 1 h to obtain a mixed component A.

[0043] 2. Preparation of a Component B

[0044] 20 parts of a polyether polyol B (PPG-204) was dried in a vacuum drying oven at a constant temperature of 110° C. for 2 h, and cooled to room temperature, and added to a reaction kettle with 55 parts of polyisocyanate and 0.05 part of the catalyst dibutyltin dilaurate in sequence, and a reactor was conducted at 50° C. for 24 h to obtain an isocyanate prepolymer; the isocyanate prepolymer was cooled to room temperature, 25 parts of a flame retardant triethyl phosphate was added, and a viscosity was adjusted to 1,000 mPa.Math.s±100 mPa.Math.s to obtain the component B.

[0045] The components A and B were mixed by stirring according to a mass ratio of 1:4 to obtain a consolidated body, and product indicators were tested according to an AQ/T 1089-2020 standard.

[0046] The test results show that: a maximum reaction temperature is 79.4° C., a curing time is 5 min, a compressive strength is not less than 40 MPa, and an oxygen index and flame retardancy meet the requirements of AQ/T 1089-2020.

[0047] The component A and the component B were mixed according to a mass ratio of 1:4 with a chemical grouting pump, a mixture was injected into a crack or cavity to be reinforced, and curing was conducted.

Example 3

[0048] 1. Preparation of a Component A

[0049] 100 parts of a polyether polyol A (YD-630, with functionality of 6 and a hydroxyl value of 490±15), 0.05 part of a catalyst dibutyltin dilaurate, and 0.05 part of a catalyst TMR-4 were added into a reaction kettle, and stirred for 1 h to obtain a mixed component A.

[0050] 2. Preparation of a Component B

[0051] 24 parts of a polyether polyol B (PPG-204) was dried in a vacuum drying oven at a constant temperature of 110° C. for 2 h, and cooled to room temperature, and added to a reaction kettle with 50 parts of polyisocyanate and 0.05 part of the catalyst dibutyltin dilaurate in sequence, and a reactor was conducted at 50° C. for 24 h to obtain an isocyanate prepolymer; the isocyanate prepolymer was cooled to room temperature, 26 parts of a flame retardant CDP was added, and a viscosity was adjusted to 1,000 mPa.Math.s±100 mPa s to obtain the component B.

[0052] The components A and B were mixed by stirring according to a mass ratio of 1:3 to obtain a consolidated body, and product indicators were tested according to an AQ/T 1089-2020 standard. The test results show that: a maximum reaction temperature is 75.1° C., a curing time is 4 min, a compressive strength is not less than 40 MPa, and an oxygen index and flame retardancy meet the requirements of AQ/T 1089-2020.

[0053] The component A and the component B were mixed according to a mass ratio of 1:3 with a chemical grouting pump, a mixture was injected into a crack or cavity to be reinforced, and curing was conducted.

Example 4

[0054] 1. Preparation of a Component A

[0055] 100 parts of a polyether polyol A (YD-6205, with functionality of 6 and a hydroxyl value of 380±15), and 0.1 part of a catalyst dibutyltin dilaurate, were added into a reaction kettle, and stirred for 1 h to obtain a mixed component A.

[0056] 2. Preparation of a Component B

[0057] 18 parts of a polyether polyol B (PPG-204) was dried in a vacuum drying oven at a constant temperature of 110° C. for 2 h, and cooled to room temperature, and added to a reaction kettle with 61 parts of polyisocyanate and 0.05 part of the catalyst dibutyltin dilaurate in sequence, and a reactor was conducted at 50° C. for 24 h to obtain an isocyanate prepolymer; the isocyanate prepolymer was cooled to room temperature, 21 parts of a flame retardant triethyl phosphate was added, and a viscosity was adjusted to 1,000 mPa.Math.s±100 mPa.Math.s to obtain the component B.

[0058] The components A and B were mixed by stirring according to a mass ratio of 1:2 to obtain a consolidated body, and product indicators were tested according to an AQ/T 1089-2020 standard. The test results show that: a maximum reaction temperature is 93° C., a curing time is 4 min, a compressive strength is not less than 40 MPa, and an oxygen index and flame retardancy meet the requirements of AQ/T 1089-2020.

Example 5

[0059] 1. Preparation of a Component A

[0060] 100 parts of a polyether polyol A (YD-635, with functionality of 6 and a hydroxyl value of 490±15), 0.05 part of a catalyst dibutyltin dilaurate, and 0.05 part of stannous octoate, were added into a reaction kettle, and stirred for 1 h to obtain a mixed component A.

[0061] 2. Preparation of a Component B

[0062] 24 parts of a polyether polyol B (PPG-204) was dried in a vacuum drying oven at a constant temperature of 110° C. for 2 h, and cooled to room temperature, and added to a reaction kettle with 50 parts of polyisocyanate and 0.05 part of the catalyst dibutyltin dilaurate in sequence, and a reactor was conducted at 50° C. for 24 h to obtain an isocyanate prepolymer; the isocyanate prepolymer was cooled to room temperature, 16 parts of a flame retardant triethyl phosphate and 10 parts of a flame retardant CDP were added, and a viscosity was adjusted to 1,000 mPa.Math.s±100 mPa.Math.s to obtain the component B.

[0063] The components A and B were mixed by stirring according to a mass ratio of 1:3 to obtain a consolidated body, and product indicators were tested according to an AQ/T 1089-2020 standard. The test results show that: a maximum reaction temperature is less than 100° C., a compressive strength is not less than 40 MPa, and an oxygen index and flame retardancy meet the requirements of AQ/T 1089-2020.

[0064] The above described are merely preferred examples of the present disclosure, and are not intended to limit the present disclosure. Any modification, equivalent substitution, and improvement without departing from the spirit and principle of the present disclosure shall be included within the protection scope of the present disclosure.